Blow-tubing

[Kurt]

Jim.

Here is a 3 shot ladder load development I ran several times on different days to see just how consistent the groups will hold up. The conditions varied from day to day with the humidity was around the mid 20's to low 30's.
I used 2F of the olde E from no compression to a just about a full case that needed to be compressed .400" the bullet was the 525 gr Baco 430-520 PP that I worked with Jim developing this mould and I have a lighter 428490 that works very good in the .44-90bn with the slower ROT but in the 1/7 ROT it dont hold up as good.
Here is how the groups turned out at 130 yards using a scope.
80 gr 2 1/4"
82 gr 1 3/4"
84 gr 2 1/2"
86 gr 2"
88 gr 5/8" 210 compression
90 gr 1/2"
90 grains is a full case with in .060 from the case mouth and my wad stack takes up .270 plus 1/8" to seat the bullet
90 gr